src/socket.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev.
   6  *                       E-mail:
   7  *                <brain@chatspike.net>
   8  *                <Craig@chatspike.net>
   9  *
  10  * Written by Craig Edwards, Craig McLure, and others.
  11  * This program is free but copyrighted software; see
  12  *            the file COPYING for details.
  13  *
  14  * ---------------------------------------------------
  15  */
  16
  17 #include <string>
  18 #include "configreader.h"
  19 #include "socket.h"
  20 #include "inspircd.h"
  21 #include "inspstring.h"
  22 #include "helperfuncs.h"
  23 #include "socketengine.h"
  24 #include "message.h"
  25
  26 extern InspIRCd* ServerInstance;
  27 extern ServerConfig* Config;
  28 extern time_t TIME;
  29
  30 /** This will bind a socket to a port. It works for UDP/TCP.
  31  * If a hostname is given to bind to, the function will first
  32  * attempt to resolve the hostname, then bind to the IP the
  33  * hostname resolves to. This is a blocking lookup blocking for
  34  * a maximum of one second before it times out, using the DNS
  35  * server specified in the configuration file.
  36  */
  37 bool BindSocket(int sockfd, insp_sockaddr client, insp_sockaddr server, int port, char* addr)
  38 {
  39         memset(&server,0,sizeof(server));
  40         insp_inaddr addy;
  41         bool resolved = false;
  42         char resolved_addr[128];
  43
  44         if (*addr == '*')
  45                 *addr = 0;
  46
  47         if (*addr && (insp_aton(addr,&addy) < 1))
  48         {
  49                 /* If they gave a hostname, bind to the IP it resolves to */
  50                 if (CleanAndResolve(resolved_addr, addr, true, 1))
  51                 {
  52                         insp_aton(resolved_addr,&addy);
  53                         log(DEFAULT,"Resolved binding '%s' -> '%s'",addr,resolved_addr);
  54 #ifdef IPV6
  55                         /* Todo: Deal with resolution of IPV6 */
  56                         server.sin6_addr = addy;
  57 #else
  58                         server.sin_addr = addy;
  59 #endif
  60                         resolved = true;
  61                 }
  62                 else
  63                 {
  64                         log(DEFAULT,"WARNING: Could not resolve '%s' to an IP for binding to on port %d",addr,port);
  65                         return false;
  66                 }
  67         }
  68 #ifdef IPV6
  69         server.sin6_family = AF_FAMILY;
  70 #else
  71         server.sin_family = AF_FAMILY;
  72 #endif
  73         if (!resolved)
  74         {
  75                 if (!*addr)
  76                 {
  77 #ifdef IPV6
  78                         memcpy(&addy, &server.sin6_addr, sizeof(in6_addr));
  79 #else
  80                         server.sin_addr.s_addr = htonl(INADDR_ANY);
  81 #endif
  82                 }
  83                 else
  84                 {
  85 #ifdef IPV6
  86                         memcpy(&addy, &server.sin6_addr, sizeof(in6_addr));
  87 #else
  88                         server.sin_addr = addy;
  89 #endif
  90                 }
  91         }
  92 #ifdef IPV6
  93         server.sin6_port = htons(port);
  94 #else
  95         server.sin_port = htons(port);
  96 #endif
  97         if (bind(sockfd,(struct sockaddr*)&server,sizeof(server)) < 0)
  98         {
  99                 return false;
 100         }
 101         else
 102         {
 103                 log(DEBUG,"Bound port %s:%d",*addr ? addr : "*",port);
 104                 if (listen(sockfd, Config->MaxConn) == -1)
 105                 {
 106                         log(DEFAULT,"ERROR in listen(): %s",strerror(errno));
 107                         return false;
 108                 }
 109                 else
 110                 {
 111                         NonBlocking(sockfd);
 112                         return true;
 113                 }
 114         }
 115 }
 116
 117
 118 // Open a TCP Socket
 119 int OpenTCPSocket()
 120 {
 121         int sockfd;
 122         int on = 1;
 123         struct linger linger = { 0 };
 124
 125         if ((sockfd = socket (AF_FAMILY, SOCK_STREAM, 0)) < 0)
 126         {
 127                 log(DEFAULT,"Error creating TCP socket: %s",strerror(errno));
 128                 return (ERROR);
 129         }
 130         else
 131         {
 132                 setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
 133                 /* This is BSD compatible, setting l_onoff to 0 is *NOT* http://web.irc.org/mla/ircd-dev/msg02259.html */
 134                 linger.l_onoff = 1;
 135                 linger.l_linger = 1;
 136                 setsockopt(sockfd, SOL_SOCKET, SO_LINGER, &linger,sizeof(linger));
 137                 return (sockfd);
 138         }
 139 }
 140
 141 bool HasPort(int port, char* addr)
 142 {
 143         for (unsigned long count = 0; count < ServerInstance->stats->BoundPortCount; count++)
 144         {
 145                 if ((port == Config->ports[count]) && (!strcasecmp(Config->addrs[count],addr)))
 146                 {
 147                         return true;
 148                 }
 149         }
 150         return false;
 151 }
 152
 153 int BindPorts(bool bail)
 154 {
 155         char configToken[MAXBUF], Addr[MAXBUF], Type[MAXBUF];
 156         insp_sockaddr client, server;
 157         int clientportcount = 0;
 158         int BoundPortCount = 0;
 159
 160         if (!bail)
 161         {
 162                 int InitialPortCount = ServerInstance->stats->BoundPortCount;
 163                 log(DEBUG,"Initial port count: %d",InitialPortCount);
 164
 165                 for (int count = 0; count < Config->ConfValueEnum(Config->config_data, "bind"); count++)
 166                 {
 167                         Config->ConfValue(Config->config_data, "bind", "port", count, configToken, MAXBUF);
 168                         Config->ConfValue(Config->config_data, "bind", "address", count, Addr, MAXBUF);
 169                         Config->ConfValue(Config->config_data, "bind", "type", count, Type, MAXBUF);
 170
 171                         if (((!*Type) || (!strcmp(Type,"clients"))) && (!HasPort(atoi(configToken),Addr)))
 172                         {
 173                                 // modules handle server bind types now
 174                                 Config->ports[clientportcount+InitialPortCount] = atoi(configToken);
 175                                 if (*Addr == '*')
 176                                         *Addr = 0;
 177
 178                                 strlcpy(Config->addrs[clientportcount+InitialPortCount],Addr,256);
 179                                 clientportcount++;
 180                                 log(DEBUG,"NEW binding %s:%s [%s] from config",Addr,configToken, Type);
 181                         }
 182                 }
 183                 int PortCount = clientportcount;
 184                 if (PortCount)
 185                 {
 186                         for (int count = InitialPortCount; count < InitialPortCount + PortCount; count++)
 187                         {
 188                                 if ((Config->openSockfd[count] = OpenTCPSocket()) == ERROR)
 189                                 {
 190                                         log(DEBUG,"Bad fd %d binding port [%s:%d]",Config->openSockfd[count],Config->addrs[count],Config->ports[count]);
 191                                         return ERROR;
 192                                 }
 193                                 if (!BindSocket(Config->openSockfd[count],client,server,Config->ports[count],Config->addrs[count]))
 194                                 {
 195                                         log(DEFAULT,"Failed to bind port [%s:%d]: %s",Config->addrs[count],Config->ports[count],strerror(errno));
 196                                 }
 197                                 else
 198                                 {
 199                                         /* Associate the new open port with a slot in the socket engine */
 200                                         if (Config->openSockfd[count] > -1)
 201                                         {
 202                                                 ServerInstance->SE->AddFd(Config->openSockfd[count],true,X_LISTEN);
 203                                                 BoundPortCount++;
 204                                         }
 205                                 }
 206                         }
 207                         return InitialPortCount + BoundPortCount;
 208                 }
 209                 else
 210                 {
 211                         log(DEBUG,"There is nothing new to bind!");
 212                 }
 213                 return InitialPortCount;
 214         }
 215
 216         for (int count = 0; count < Config->ConfValueEnum(Config->config_data, "bind"); count++)
 217         {
 218                 Config->ConfValue(Config->config_data, "bind", "port", count, configToken, MAXBUF);
 219                 Config->ConfValue(Config->config_data, "bind", "address", count, Addr, MAXBUF);
 220                 Config->ConfValue(Config->config_data, "bind", "type", count, Type, MAXBUF);
 221
 222                 if ((!*Type) || (!strcmp(Type,"clients")))
 223                 {
 224                         // modules handle server bind types now
 225                         Config->ports[clientportcount] = atoi(configToken);
 226
 227                         // If the client put bind "*", this is an unrealism.
 228                         // We don't actually support this as documented, but
 229                         // i got fed up of people trying it, so now it converts
 230                         // it to an empty string meaning the same 'bind to all'.
 231                         if (*Addr == '*')
 232                                 *Addr = 0;
 233
 234                         strlcpy(Config->addrs[clientportcount],Addr,256);
 235                         clientportcount++;
 236                         log(DEBUG,"Binding %s:%s [%s] from config",Addr,configToken, Type);
 237                 }
 238         }
 239
 240         int PortCount = clientportcount;
 241
 242         for (int count = 0; count < PortCount; count++)
 243         {
 244                 if ((Config->openSockfd[BoundPortCount] = OpenTCPSocket()) == ERROR)
 245                 {
 246                         log(DEBUG,"Bad fd %d binding port [%s:%d]",Config->openSockfd[BoundPortCount],Config->addrs[count],Config->ports[count]);
 247                         return ERROR;
 248                 }
 249
 250                 if (!BindSocket(Config->openSockfd[BoundPortCount],client,server,Config->ports[count],Config->addrs[count]))
 251                 {
 252                         log(DEFAULT,"Failed to bind port [%s:%d]: %s",Config->addrs[count],Config->ports[count],strerror(errno));
 253                 }
 254                 else
 255                 {
 256                         /* well we at least bound to one socket so we'll continue */
 257                         BoundPortCount++;
 258                 }
 259         }
 260
 261         /* if we didn't bind to anything then abort */
 262         if (!BoundPortCount)
 263         {
 264                 log(DEFAULT,"No ports bound, bailing!");
 265                 printf("\nERROR: Could not bind any of %d ports! Please check your configuration.\n\n", PortCount);
 266                 return ERROR;
 267         }
 268
 269         return BoundPortCount;
 270 }
 271
 272 const char* insp_ntoa(insp_inaddr n)
 273 {
 274         static char buf[1024];
 275         inet_ntop(AF_FAMILY, &n, buf, sizeof(buf));
 276         return buf;
 277 }
 278
 279 int insp_aton(const char* a, insp_inaddr* n)
 280 {
 281         return inet_pton(AF_FAMILY, a, n);
 282 }
 283